单项选择题

What will happen to the workers if the machines are painted gray compared with orange()

A. Workers may be more cheerful and energetic.
B. More errors and accidents will occur.
C. There is no difference at all.
D.They will be more active and curious.

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When did the unemployment rate begin to increase()

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B. Last May.
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What will happen to the workers if the machines are painted gray compared with orange()